3 in 1 detector 1).Metal test 2).Stud test 3).AC wires test 4).with ROHS Locate the exact position ... distanceStudwood(60*60*20mm),deep≥2cm,standard≥1.5cmMetalpipe(¢20*150mm),deep≥3cm standard≥1.5cmAC electrification cable(90~380v,50~60HZ ... ,6F22Battery Life1 year with normal useDiension224x92x41mmWeight(with battery)about 300g 3 IN 1 Metal Detector